# CVE-1999-0416: Denial of service in n/a

> Remote attackers can crash Cisco 7xx series routers by sending a TCP connection to the Telnet port, causing a system reload.

- **Severity:** Medium 5.0 (`AV:N/AC:L/Au:N/C:N/I:N/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 12 Jul 2000
- **Updated:** 1 Aug 2024
- **Also known as:** GHSA-p3w3-x7jr-4c3v

## What is CVE-1999-0416?

CVE-1999-0416 is a medium-severity denial of service vulnerability in n/a, published on 12 Jul 2000. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Vulnerability in Cisco 7xx series routers allows a remote attacker to cause a system reload via a TCP connection to the router's TELNET port.

## Which versions are affected by CVE-1999-0416?

It affects 1 product.


Products: Cisco Cisco 7xx Routers.

## How do I fix CVE-1999-0416?

No fix has been published for CVE-1999-0416 yet. Limit exposure of the affected software until one is available.

## Is CVE-1999-0416 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-1999-0416 exists.

Public exploit code:

- Cisco 7xx Series Router - Denial of Service (exploitdb)

## Other vulnerabilities in n/a

- [CVE-1999-0415](https://insights.sbomify.com/CVE-1999-0415/): Missing authorization in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-1999-0416 and fix it if it is affected.

What it is: CVE-1999-0416 is a medium-severity denial of service vulnerability in n/a, published on 12 Jul 2000. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-1999-0416 exists.

Affected product: n/a. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-1999-0416/ (Markdown: https://insights.sbomify.com/CVE-1999-0416/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-1999-0416
- NVD: https://nvd.nist.gov/vuln/detail/CVE-1999-0416
- OSV: https://osv.dev/vulnerability/CVE-1999-0416

---
From sbomify Insights: https://insights.sbomify.com/CVE-1999-0416/
Summaries are generated and may contain mistakes; the official description above is the record.